Daimler had been one of three manufacturers (the others being Bristol and Guy) sanctioned to build double deck chassis during the Second World War. The utility wartime model, the CW, was to evolve into the postwar CVseries in 1946, and variants of the CV continued in production until the closing years of halfcab production in 1968. The main options were the CVG5 (Gardner 5LW engine) and CVG6 (Gardner 6LW or 6LX engine), plus in the earlier years the CVD6 (Daimler CD6 engine) and CVA6 (AEC A173 engine). The CV series featured the Daimler standards of fluid flywheel and pre-selector gearbox, though in the latter years of production there was a synchromesh option. In 1950 Daimler had also introduced the so-called "new look" front with concealed radiator, initially to the requirements of Birmingham City Transport.

Apart from a handful of pioneer buses in the early years before the First World War, Halifax did not have any Daimlers in its fleet until 1951 when six of the rare CD650 model joined the Corporation fleet. CVG6s were ordered for 1954 and 1956, those for the Corporation having Roe bodies and those for the Joint Omnibus Committee having MetroCammell bodies. The Roe bodied vehicles featured teak framed lower decks but alloy framed top decks.

GJX 331 was the last of the 1956 CVG6s and entered the Corporation fleet in November that year as fleet number 19. In 1958 it was renumbered as 119. In 1971 it was transferred into the Joint Omnibus Committee fleet which resulted in a further fleet number change to 304. With the amalgamation of the Halifax and Todmorden joint committees it became part of the Calderdale Joint Omnibus Committee fleet in September 1971. In 1972 it was once again renumbered as 384 and on passing to the West Yorkshire PTE in 1974, it gained its fifth fleet number as 3384.

It was withdrawn from PTE service in October 1974 and stored for some years as a potential preservation candidate and eventually sold in March 1981 to a Halifax preservationist, being kept for a time at the Tameside Transport Collection in Ashton. In November 1984 it was acquired by the West Yorkshire Transport Museum and subsequently restored. It was acquired by Keighley Bus Museum from the administrators of Transperience in September 1998 with support from the Heritage Lottery Fund, the Science Museum PRISM Fund and Bradford Metropolitan Borough Council.